>>571202
>God creates Adam and Eve
>They are the only people on Earth
>The entire world, at this point, knows God and his religion
>Later
>Noah and his family are the only people who serve God and his religion
>The entire rest of the world is destroyed
>The entire world, at this point, again knows God and his religion
>The religion gets corrupted over the years, but elements remain
This is why all cultures have the concept of one supreme god not necessarily monotheism, but just one god who is creator of all and supreme. Egyptians had Amun-Ra and Persians had Ahura Mazda. The Greeks and the Chinese had The Unknown God (the Greek god is mentioned in Acts 17. The Chinese called him Shang Di, and they actually had a paraphrase of Genesis 1 used as a prayer. Look it up.) All cultures understood that there was one supreme God who created all. All cultures have a flood myth. All cultures understand that there is a Heaven and many understand that there is a Hell too. All cultures understand these basic elements of Christianity, and many Greek philosophers even worked their way up to basically being Christians before Christ came.